$\int\frac{x+\cos x}{3x^{2}+6\sin x}dx$
$-y^2=y-2$
$z=x^2+y^2+3$
$x\frac{4}{3}x-3$
$\lim_{x\to6}\left(\ln\left(x^2-36\right)\right)$
$-49a^{10}^n-\frac{h^{12x}}{81}$
$\frac{x^2-2}{x^2+5x+4}+\frac{x^2-16}{x+1}$
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